CN112688436A - Arc suppression coil online sensing system and method based on power distribution internet of things - Google Patents
Arc suppression coil online sensing system and method based on power distribution internet of things Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/128—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment involving the use of Internet protocol
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Abstract
The invention discloses an arc suppression coil online sensing system and method based on a power distribution Internet of things, and the system comprises an arc suppression coil, an arc suppression coil measurement and control device, a power distribution Internet of things module and a power distribution automation platform, wherein the arc suppression coil measurement and control device acquires electrical state parameters related to the operating state of the arc suppression coil; the power distribution internet of things module is used for performing edge calculation on the electrical state parameters acquired by the arc suppression coil measurement and control device to obtain fault information of the arc suppression coil; the power distribution automation platform is used for managing the arc extinguishing coil according to the received electrical state parameters and fault information, generating a corresponding remote control command and sending the remote control command to the power distribution Internet of things module; the arc suppression coil measurement and control device controls the arc suppression coil according to the remote control instruction; the method is based on the power distribution internet of things, combines the edge computing technology, the communication encryption technology and the data processing technology to sense and comprehensively manage the operating state of the arc suppression coil of the power distribution network, and reflects the operating state of the arc suppression coil more truly and clearly.
Description
Technical Field
The invention relates to the field of distribution automation, in particular to an arc suppression coil online sensing system and method based on a distribution Internet of things.
Background
The arc suppression coil is an electric device for arc suppression, and is essentially an inductance coil with an iron core. It is connected between neutral point of transformer and ground to form arc suppression coil grounding system. The power transmission line of the power system is grounded through the arc suppression coil, is one of small-current grounding systems, and is widely applied to a power distribution network. When the arc suppression coil operates normally, no current passes through the arc suppression coil. When the power grid is struck by lightning or single-phase arc grounding occurs, the potential of the neutral point rises to the phase voltage, and the inductive current flowing through the arc suppression coil and the capacitive fault current of the single-phase grounding are mutually offset, so that the fault current is compensated. The residual current after compensation is small and is not enough to maintain the arc burning, so that the arc self-extinguishes. Thus, the earth fault can be eliminated quickly without causing arcing and overvoltage. At present, a plurality of problems exist in the management and application aspects of the arc suppression coil, and the normal use effect of the arc suppression coil is seriously influenced. At present, the operating state of the arc suppression coil is sensed and managed mainly through a dispatching system, but because the voltage level of a power distribution network applied by the arc suppression coil is low and the quantity is large, the control degree in the dispatching system is low, and meanwhile, because of the operation and maintenance problem of a transformer substation, the operating state of the arc suppression coil is difficult to truly reflect, and great challenge and unknown risk are brought to the operation of the power distribution network.
Disclosure of Invention
The invention aims to solve the technical problem that an online sensing and comprehensive management system for the operating state of an arc suppression coil is lacked at present, and aims to provide an online sensing system and an online sensing method for the arc suppression coil based on a power distribution internet of things.
The invention is realized by the following technical scheme:
an arc suppression coil online sensing system based on a power distribution Internet of things comprises an arc suppression coil, an arc suppression coil measurement and control device, a power distribution Internet of things module and a power distribution automation platform, wherein,
the arc suppression coil measurement and control device is used for acquiring electrical state parameters related to the operation state of the arc suppression coil;
the distribution Internet of things module is used for performing edge calculation on the electrical state parameters acquired by the arc suppression coil measurement and control device to obtain fault information of the arc suppression coil;
the power distribution automation platform is used for managing arc extinguishing coils according to the received electrical state parameters and the fault information, generating corresponding remote control instructions and issuing the remote control instructions to a power distribution Internet of things module;
and the arc suppression coil measurement and control device controls the arc suppression coil according to the remote control instruction forwarded by the power distribution Internet of things module.
At present, the operation state perception and management of the arc suppression coil mainly pass through a dispatching system, but because the distribution network voltage level applied by the arc suppression coil is low and the quantity is huge, the control degree in the dispatching system is low, meanwhile, because of the operation and maintenance problems of a transformer substation field, the operation state of the arc suppression coil is difficult to truly reflect, great challenges and unknown risks are brought to the operation of the distribution network, the scheme is based on the distribution internet of things, the online perception system and the online perception method for the operation state of the arc suppression coil of the distribution network, which are based on the edge calculation technology, the communication encryption technology and the data processing technology, the blank of the existing distribution network in the aspect of the perception system for the operation state of the arc suppression coil is filled, the operation state of the arc suppression coil is.
Further, the electrical state parameters include, but are not limited to, device codes, capacities, profile information, displacement voltages, inductive currents, capacitive currents, residual currents, gear positions, bus-tie states, and other electrical and state quantity information of the arc suppression coil.
Further, the power distribution automation platform manages the arc suppression coil, and the management comprises recording a full life cycle file of the arc suppression coil, identifying familial defects of the arc suppression coil and analyzing and predicting capacity reserves of the arc suppression coil of the regional power distribution network.
Further, the edge calculation includes: checking the running state of the arc suppression coil; and recording and analyzing the arc suppression coil action response characteristics.
In addition, an arc suppression coil online sensing method based on the power distribution internet of things is provided, and is applied to the arc suppression coil online sensing system based on the power distribution internet of things, and step S1 is used for reading electrical state parameters related to the operation state of the arc suppression coil, which are acquired by an arc suppression coil measurement and control device;
step S2, according to the read electrical state parameters, performing edge calculation on the operating state of the arc suppression coil to obtain fault information of the arc suppression coil;
step S3, the electric state parameters read in the step S1 and the fault information in the step S2 are encrypted and uploaded to a distribution automation platform;
and S4, decrypting the encrypted remote control command of the distribution automation platform, sending the decrypted remote control command to the arc suppression coil measurement and control device, and controlling the arc suppression coil by the arc suppression coil measurement and control device according to the received remote control command.
Further, the edge calculation in step S2 includes verifying the operating status of the arc suppression coil and recording and analyzing the response characteristics of the arc suppression coil.
Further, verifying the operating state of the arc suppression coil comprises:
judging whether the switching state of the arc suppression coil is correct or not;
judging whether the capacity and the gear of the arc suppression coil are matched with a system, wherein the system is a power distribution network system provided with the arc suppression coil;
when the check-up result of arc suppression coil running state for the arc suppression coil not be in correct switching state, arc suppression coil capacity and gear with when the system did not match (the arc suppression coil gear is not in the best condition or the arc suppression coil capacity is not enough), distribution thing networking module generates arc suppression coil's fault information, and the abnormal state warning light in the distribution thing networking module is lighted to pass through the distribution automation platform on the wireless communication network after encrypting fault information.
Further, the process of judging whether the switching state of the arc suppression coil is correct is as follows: judging whether the arc suppression coil is switched on or off according to the shift voltage of the neutral point, and judging the switching of the arc suppression coil when the shift voltage is not zero and has small fluctuation; if the displacement voltage of the neutral point of the arc suppression coil is zero or a certain constant value, judging that the arc suppression coil is not put into the furnace, wherein the criterion formula is as follows:
Uun=0 OR(Uun(n-5)= Uun(n-4)= Uun(n-3)= Uun(n-2)= Uun(n-1)= Uun(n))
wherein, UunIs a neutral point shift voltage, Uun(n-5)~ Uun(n) is the neutral point displacement voltage of 6 sampling points which are continuously arranged from the n-5 th sampling point to the back; if the criterion is met, the arc suppression coil is judged to exit, and if the criterion is not met, the arc suppression coil is judged to be put in.
Further, the process of judging whether the capacity and the gear of the arc suppression coil are matched with the system is as follows:
calculating the capacitance current in the power distribution network installed by the arc-extinguishing coil, and calculating the equivalent capacitance-to-ground value of the system through the neutral point displacement voltage, wherein the system equivalent capacitance-to-ground reactanceX c The calculation method is as follows:
wherein the content of the first and second substances,X xq putting a reactance corresponding to a gear for the arc suppression coil;U wy is the system displacement voltage;I xh the current flowing in the arc suppression coil;r the resistance value is the series resistance value of the arc suppression coil; j representsX c Imaginary unit of (d);
expression solutionU wy The first derivative of (a);
of the representationI xh A first derivative;
calculating residual current of grounding point after single-phase grounding faultI re ：
Wherein the content of the first and second substances,U ph is the system phase voltage;
judging thatX c AndI re whether or not: non-viable cells X xq |＜| X c L andI re |＜10A，
if the judgment result is satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is matched with the equivalent ground capacitance of the system, namely the capacity and the gear of the arc suppression coil are matched with the system;
and if the judgment result is not satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is not matched with the equivalent ground capacitance of the system, namely the capacity and the gear of the arc suppression coil are not matched with the system.
Further, the recording and analyzing arc suppression coil action response characteristic process is as follows:
recording a waveform diagram of the change condition of the electrical state parameters, wherein the change condition comprises the change of displacement voltage waveform, the change condition of arc suppression coil compensation current and the change condition of a series resistance bypass switch;
and calculating the response time of the arc suppression coil according to the electrical state parameters and the change situation oscillogram, comparing the response time with a pre-stored standard value, checking whether the action response characteristic of the arc suppression coil is correct or not, encrypting a check result, and adding the check result into the fault information to upload the fault information to a power distribution automation platform through a wireless communication network.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention discloses an arc suppression coil online sensing system and method based on a power distribution internet of things, provides a power distribution network arc suppression coil operating state online sensing system and method fusing an edge calculation technology, a communication encryption technology and a data processing technology based on the power distribution internet of things, fills the blank of the existing power distribution network in the aspect of the arc suppression coil operating state sensing system, realizes the comprehensive management of arc suppression coils based on the full-life period file record of the arc suppression coils, the familial defect identification of the arc suppression coils and the analysis and prediction of the capacity reserve of the arc suppression coils of a regional power distribution network on the basis of a power distribution automation platform, and reflects the operating state of the arc suppression coils more truly and clearly.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Example 1
The embodiment of the online sensing system for the arc suppression coil based on the power distribution Internet of things comprises the arc suppression coil, an arc suppression coil measurement and control device, a power distribution Internet of things module and a power distribution automation platform, wherein,
the arc suppression coil measurement and control device is used for acquiring electrical state parameters related to the operation state of the arc suppression coil;
the distribution Internet of things module is used for performing edge calculation on the electrical state parameters acquired by the arc suppression coil measurement and control device to obtain fault information of the arc suppression coil;
the power distribution automation platform is used for managing the arc extinguishing coil according to the received electrical state parameters and the fault information, generating a corresponding remote control command and sending the remote control command to the power distribution Internet of things module;
and the arc suppression coil measurement and control device controls the arc suppression coil according to the remote control instruction forwarded by the power distribution Internet of things module.
At present, the operation state perception and management of the arc suppression coil mainly pass through a dispatching system, but the distribution network voltage level applied by the arc suppression coil is low and the quantity is huge, the control degree in the dispatching system is low, meanwhile, due to the operation and maintenance problems of a transformer substation field, the operation state of the arc suppression coil is difficult to truly reflect, great challenges and unknown risks are brought to the operation of the distribution network, the scheme is based on the distribution internet of things, the online perception system and the online perception method for the operation state of the arc suppression coil of the distribution network, which are integrated with an edge calculation technology, a communication encryption technology and a data processing technology, are provided, the blank of the existing distribution network in the aspect of the perception system for the operation state of the arc suppression coil is filled, the operation state of the arc suppression coil.
Specifically, as shown in fig. 1, the power distribution internet of things module includes a communication module, a data analysis and storage module, and a data transmission module, and the power distribution automation platform includes an arc suppression coil monitoring and management system, a communication analysis module, and a data forwarding module; wherein, when data transmitted the distribution automation platform from arc suppression coil, the data process of going upward was: the data transmission module reads the electric state parameters collected by the arc suppression coil measurement and control device and forwards the electric state parameters to the data analysis and storage module, the data analysis and storage module stores the received electric state parameters and carries out edge calculation on the electric state parameters to obtain fault information of the arc suppression coil, the edge calculation comprises checking the operation state of the arc suppression coil, recording and analyzing the action response characteristics of the arc suppression coil and the like, the checking of the operation state of the arc suppression coil comprises processes of switching check, gear check, capacity storage, abnormal identification and the like, the communication module encrypts the electric state parameters and the fault information transmitted by the data analysis and storage module, and the encrypted electric state parameters and the encrypted fault information are uploaded to the power distribution automation platform through a communication network. The communication analysis module of the power distribution automation platform decrypts the received encrypted electrical state parameters and fault information, and the data forwarding module stores the decrypted electrical state parameters and fault information and forwards the decrypted electrical state parameters and fault information to the arc suppression coil monitoring and management system; and the arc suppression coil monitoring and management system manages the arc suppression coil according to the electrical state parameters and the fault information and generates a corresponding remote control instruction. The data downlink process when the remote control command is issued to the arc suppression coil measurement and control device is as follows: the data forwarding module stores and forwards the remote control command to the communication analysis module, and the communication analysis module encrypts the received remote control command and transmits the encrypted remote control command to the power distribution Internet of things module through a communication network; the communication module in the power distribution internet of things module decrypts the received encrypted remote control command, the data analysis and storage module forwards the decrypted remote control command to the data transmission module, the data transmission module issues the remote control command to the arc suppression coil measurement and control device, and the arc suppression coil measurement and control device controls the arc suppression coil according to the remote control command.
Specifically, the distribution internet of things module reads relevant electrical state parameters of the operating state of the arc suppression coil measurement and control device through an RS485 hardware interface, and the relevant electrical state parameters comprise electrical quantities and state quantity information of equipment codes, capacity, file information, displacement voltage, inductive current, capacitive current, residual current, gears, bus tie states and the like of the arc suppression coil.
Specifically, the arc suppression coil monitoring management system utilizes the arc suppression coil running state information sent to the distribution automation platform from the distribution internet of things module, and can perform management functions including but not limited to the following:
1) recording the life cycle file of the arc suppression coil: recording the conditions of electric quantity and state quantity of the arc suppression coil from installation to retirement in a full life cycle into a file by utilizing the storage capacity of the distribution automation platform, and recording the file in two time scales according to two conditions of a non-fault working condition and a fault working condition; the electrical quantities recorded include: displacement voltage, capacitance current, inductance current and residual current; the recorded state quantities include: the arc suppression coil is connected with a resistor bypass switch state and an arc suppression coil switching state in series; when no fault occurs, the electrical quantity and the state quantity are updated every 15 min; and in the fault state, sampling at a 4800Hz sampling rate.
2) Identifying the familial defects of the arc suppression coil: by analyzing the numbers of the abnormal or fault arc suppression coils with higher frequency, the familial defects of the equipment are found, and a statistical table of the defect conditions of the arc suppression coils is established, as shown in table 1:
TABLE 1 statistical table of arc suppression coil defect situation
| Serial number | Cause of failure | Model of the device | Device numbering |
| 1 | Reason 1 | Type A | Number 1 |
| 2 | Reason 1 | Type A | Number 2 |
| 3 | Reason 1 | Type A | Number 3 |
| 4 | Reason 2 | Type A | Number 4 |
| …… | ……. | ……. | ……. |
The fault condition of arc suppression coils which are all brought into the centralized management of the distribution automation platform through the distribution internet of things module is counted by utilizing the upper table, if the quantity of equipment with the same fault and the same type of equipment which is led out exceeds M%, the equipment is determined to be a familial defect, wherein M is a settable numerical value and is set through a human-computer interface of the distribution automation platform.
3) Analyzing and predicting capacity reserves of arc suppression coils of the regional power distribution network: the capacity reserve condition of the arc suppression coil is analyzed by combining the topological change, the development planning and the load prediction condition of the regional power distribution network, the capacity reserve condition of the arc suppression coil is reasonably adjusted according to the actual condition, the capacity reserve condition of the arc suppression coil is estimated mainly according to the total line length and is described by the capacity reserve percentage eta:
wherein, XLminMinimum inductive reactance value, U, corresponding to different gears of arc suppression coilphIs the system phase voltage in unit kV; i iscThe estimation method for the system capacitance current, unit A, is as follows:
for overhead lines:
wherein L is the length of the overhead line and is a unit of km;
for power cables:
wherein S is the cable sectional area in mm2。
Example 2
As shown in fig. 2, the embodiment provides an arc suppression coil online sensing method based on a power distribution internet of things, which is applied to the arc suppression coil online sensing system based on the power distribution internet of things, and includes the following steps:
step S1, reading the electric state parameters related to the operation state of the arc suppression coil collected by the arc suppression coil measurement and control device; the electrical state parameters comprise electrical quantity and state quantity information such as equipment codes, capacity, file information, displacement voltage, inductive current, capacitive current, residual current, gears, bus connection state and the like;
step S2, according to the read electrical state parameters, performing edge calculation on the operating state of the arc suppression coil to obtain fault information of the arc suppression coil;
step S3, the electric state parameters read in the step S1 and the fault information in the step S2 are encrypted and uploaded to a distribution automation platform; the management of the arc extinguishing coil by the power distribution automation platform according to the electrical state parameters and the fault information comprises the following steps: recording the life cycle file of the arc suppression coil, identifying the familial defect of the arc suppression coil, and analyzing and predicting the capacity reserve of the arc suppression coil of the regional power distribution network.
And S4, decrypting the encrypted remote control command of the distribution automation platform, sending the decrypted remote control command to the arc suppression coil measurement and control device, and controlling the arc suppression coil by the arc suppression coil measurement and control device according to the received remote control command.
Specifically, the edge calculation and state verification in step S2 includes verifying the operating state of the arc suppression coil and recording and analyzing the response characteristics of the arc suppression coil;
wherein, the check-up of arc suppression coil running state includes:
1) judging whether the switching state of the arc suppression coil is correct: judging whether the arc suppression coil is switched on or off according to the shift voltage of the neutral point, and judging the switching of the arc suppression coil when the shift voltage is not zero and has small fluctuation; if the displacement voltage of the neutral point of the arc suppression coil is zero or a certain constant value, judging that the arc suppression coil is not put into the furnace, wherein the criterion formula is as follows:
Uun=0 OR(Uun(n-5)= Uun(n-4)= Uun(n-3)= Uun(n-2)= Uun(n-1)= Uun(n))
wherein, UunIs a neutral point shift voltage, Uun(n-5)~ Uun(n) is the neutral point displacement voltage of 6 sampling points which are continuously arranged from the n-5 th sampling point to the back; if the criterion is met, the arc suppression coil is judged to exit, and if the criterion is not met, the arc suppression coil is judged to be put in.
2) Judging whether the capacity and the gear of the arc suppression coil are matched with a system, wherein the system is a power distribution network system provided with the arc suppression coil: calculating the capacitance current in the power distribution network installed by the arc-extinguishing coil, and calculating the equivalent capacitance-to-ground value of the system through the neutral point displacement voltage, wherein the system equivalent capacitance-to-ground reactanceX c The calculation method is as follows:
wherein the content of the first and second substances,X xq putting a reactance corresponding to a gear for the arc suppression coil;U wy is the system displacement voltage;I xh the current flowing in the arc suppression coil;r the resistance value is the series resistance value of the arc suppression coil; j representsX c Imaginary unit of (d);
expression solutionU wy The first derivative of (a);
of the representationI xh A first derivative;
calculating residual current of grounding point after single-phase grounding faultI re ：
Wherein the content of the first and second substances,U ph is the system phase voltage;
judging thatX c AndI re whether satisfies- X xq |＜| X c L andI re |＜10A，
if the judgment result is satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is matched with the equivalent ground capacitance, namely the capacity and the gear of the arc suppression coil are matched with the system;
if the judgment result is not satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is not matched with the equivalent ground capacitance of the system, namely the capacity and the gear of the arc suppression coil are not matched with the system.
Specifically, when the check result of arc suppression coil running state is that the arc suppression coil is not in the correct state of going back, arc suppression coil capacity and gear and system mismatch (the arc suppression coil gear is not in the best condition or the arc suppression coil capacity is not enough), distribution thing networking module generates arc suppression coil's fault information, and the abnormal state warning light in the distribution thing networking module is lighted to pass through wireless communication network and upload distribution automation platform after encrypting fault information.
Recording and analyzing the action response characteristics of the arc suppression coil, comparing and analyzing the action response characteristics of the arc suppression coil with historical response records of the arc suppression coil, checking whether the response characteristics are correct or not, encrypting a judgment result and uploading the judgment result to a power distribution automation platform through wireless communication; the specific process is as follows: after the single-phase earth fault occurs, recording a waveform diagram of the change conditions of the relevant state quantity of the arc suppression coil and the electrical state parameters of the electrical quantity by a power distribution internet of things module, wherein the change conditions comprise the change of displacement voltage waveform, the change condition of compensation current of the arc suppression coil and the change condition of a series resistance bypass switch;
and calculating the response time of the arc suppression coil according to the electrical state parameters and the change situation oscillogram, comparing the response time with a pre-stored standard value, checking whether the action response characteristic of the arc suppression coil is correct or not, encrypting a check result, and adding the check result into the fault information to upload the fault information to a power distribution automation platform through a wireless communication network.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An arc suppression coil online sensing system based on a power distribution Internet of things is characterized by comprising an arc suppression coil, an arc suppression coil measurement and control device, a power distribution Internet of things module and a power distribution automation platform, wherein,
the arc suppression coil measurement and control device is used for acquiring electrical state parameters related to the operation state of the arc suppression coil;
the distribution Internet of things module is used for performing edge calculation on the electrical state parameters acquired by the arc suppression coil measurement and control device to obtain fault information of the arc suppression coil;
the power distribution automation platform is used for managing arc extinguishing coils according to the received electrical state parameters and the fault information, generating corresponding remote control instructions and issuing the remote control instructions to a power distribution Internet of things module;
and the arc suppression coil measurement and control device controls the arc suppression coil according to the remote control instruction forwarded by the power distribution Internet of things module.
2. An arc suppression coil online sensing system based on a power distribution internet of things as claimed in claim 1, wherein the electrical state parameters comprise equipment codes, capacity, archive information, displacement voltage, inductive current, capacitive current, residual current, gear and bus tie state of the arc suppression coil.
3. An arc suppression coil online sensing system based on a power distribution internet of things as claimed in claim 1, wherein the management of the arc suppression coil comprises recording a full life cycle file of the arc suppression coil, identifying familial defects of the arc suppression coil, and analyzing and predicting capacity reserves of the arc suppression coil of a regional power distribution network.
4. The system of claim 1, wherein the edge calculation comprises: checking the running state of the arc suppression coil;
and recording and analyzing the arc suppression coil action response characteristics.
5. An arc suppression coil online sensing method based on a power distribution internet of things is applied to the arc suppression coil online sensing system based on the power distribution internet of things in claim 1, and is characterized by comprising the following steps:
step S1, reading the electric state parameters related to the operation state of the arc suppression coil collected by the arc suppression coil measurement and control device;
step S2, according to the read electrical state parameters, performing edge calculation on the operating state of the arc suppression coil to obtain fault information of the arc suppression coil;
step S3, the electric state parameters read in the step S1 and the fault information in the step S2 are encrypted and uploaded to a distribution automation platform;
and S4, decrypting the encrypted remote control command of the distribution automation platform, sending the decrypted remote control command to the arc suppression coil measurement and control device, and controlling the arc suppression coil by the arc suppression coil measurement and control device according to the received remote control command.
6. The online sensing method for the arc suppression coil based on the power distribution internet of things as claimed in claim 5, wherein the edge calculation in step S2 comprises: checking the running state of the arc suppression coil;
and recording and analyzing the arc suppression coil action response characteristics.
7. The online sensing method for the arc suppression coil based on the power distribution internet of things as claimed in claim 6, wherein the step of verifying the operation state of the arc suppression coil comprises the following steps:
judging whether the switching state of the arc suppression coil is correct or not;
judging whether the capacity and the gear of the arc suppression coil are matched with a system, wherein the system is a power distribution network system provided with the arc suppression coil;
and when the operation state of the arc suppression coil is verified to be that the arc suppression coil is not in a correct switching state, the capacity and the gear of the arc suppression coil are not matched with the system, the power distribution Internet of things module generates fault information of the arc suppression coil.
8. The online sensing method for the arc suppression coil based on the power distribution internet of things as claimed in claim 7, wherein the process of judging whether the switching state of the arc suppression coil is correct is as follows:
judging whether the arc suppression coil is switched on or off according to the shift voltage of the neutral point, and judging the switching of the arc suppression coil when the shift voltage is not zero and has small fluctuation; if the displacement voltage of the neutral point of the arc suppression coil is zero or a constant value, judging that the arc suppression coil is not put into the furnace, wherein the criterion formula is as follows:
Uun=0 OR(Uun(n-5)= Uun(n-4)= Uun(n-3)= Uun(n-2)= Uun(n-1)= Uun(n))
wherein, UunIs a neutral point shift voltage, Uun(n-5)~ UunAnd (n) is the neutral point displacement voltage of 6 sampling points which are continuously arranged from the n-5 th sampling point to the back.
9. The online sensing method of the arc suppression coil based on the power distribution internet of things as claimed in claim 7, wherein the process of judging whether the capacity and the gear of the arc suppression coil are matched with the system is as follows:
calculating the capacitance current in the power distribution network installed by the arc-extinguishing coil, and equivalent earth capacitance reactance by a neutral point displacement voltage calculation systemX c The calculation method is as follows:
wherein the content of the first and second substances,X xq putting a reactance corresponding to a gear for the arc suppression coil;U wy is the system displacement voltage;I xh the current flowing in the arc suppression coil;r the resistance value is the series resistance value of the arc suppression coil; j representsX c Imaginary unit of (d);
expression solutionU wy The first derivative of (a);
of the representationI xh A first derivative;
calculating residual current of grounding point after single-phase grounding faultI re ：
Wherein the content of the first and second substances,U ph is the system phase voltage;
judging thatX c AndI re whether or not: non-viable cells X xq |＜| X c L andI re |＜10A，
if the judgment result is satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is matched with the equivalent ground capacitance of the system;
and if the judgment result is not satisfied, judging that the inductance value corresponding to the input gear of the arc suppression coil is not matched with the equivalent ground capacitance of the system.
10. The online sensing method for the arc suppression coil based on the power distribution internet of things as claimed in claim 6, wherein the recording and analyzing process for the response characteristics of the arc suppression coil action comprises the following steps:
recording a waveform diagram of the change condition of the electrical state parameters, wherein the change condition comprises the change of displacement voltage waveform, the change condition of arc suppression coil compensation current and the change condition of a series resistance bypass switch;
and calculating the response time of the arc suppression coil according to the electrical state parameters and the change situation oscillogram, comparing the response time with a pre-stored standard value, checking whether the action response characteristic of the arc suppression coil is correct or not, encrypting a check result, and adding the check result into the fault information to upload the fault information to a power distribution automation platform through a wireless communication network.
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